[S] Change in coreboot[main]: lib: Add Kconfig variable for fw_config default value

[Cliff Huang (Code Review)]

Attention is currently required from: Anil Kumar K, Bora Guvendik, Julius Werner, Paul Menzel, Subrata Banik, Wonkyu Kim.

Hello Anil Kumar K, Bora Guvendik, Jérémy Compostella, Subrata Banik, Wonkyu Kim, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/83153?usp=email

to look at the new patch set (#5).

Change subject: lib: Add Kconfig variable for fw_config default value
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lib: Add Kconfig variable for fw_config default value

This CONFIG_FW_CONFIG_DEFAULT_VALUE is used only when CBI fw_config
value cannot be read from all sources such as Chrome EC and VPD. It
defaults to the same value as UNDEFINED_FW_CONFIG defined in
fw_config.h; and it won't be used unless it is set to different value in
config.<board> file. If a valid value is read from the Chrome EC or VPD,
the fw_config value will not be overriden by this flag.

TEST=boot and check fw_config value from coreboot log

Signed-off-by: Cliff Huang 
Change-Id: I9694433e01bdcd9ff1e550585c14ea7ccee020a3
---
M src/Kconfig
M src/lib/fw_config.c
2 files changed, 16 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/53/83153/5